From: Stephen Hemminger <shemminger@osdl.org>
To: Tobias DiPasquale <codeslinger@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>,
John Heffner <jheffner@psc.edu>,
mlists@danielinux.net, linux-net@vger.kernel.org,
linux-kernel@vger.kernel.org, ccaini@deis.unibo.it,
rfirrincieli@arces.unibo.it
Subject: Re: [PATCH] TCP-Hybla proposal
Date: Tue, 22 Feb 2005 20:22:18 -0800 [thread overview]
Message-ID: <421C04FA.8090706@osdl.org> (raw)
In-Reply-To: <876ef97a050222164140968e15@mail.gmail.com>
> On Tue, 22 Feb 2005 10:14:47 -0800, David S. Miller <davem@davemloft.net> wrote:
>
>>> On Tue, 22 Feb 2005 13:03:11 -0500 (EST)
>>> John Heffner <jheffner@psc.edu> wrote:
>>>
>>
>>>> > An idea I've been toying with for a while now is completely abstracting
>>>> > congestion control. Then you could have congestion control loadable
>>>> > modules, which would avoid this mess of experimental algorithms inside the
>>>> > main-line kernel. If done right, they might be able to work seamlessly
>>>> > with SCTP, too. The tricky part is making sure the interface is complete
>>>> > enough.
There might be a noticeable performance impact to making it truly
modular. Calling a function in a module is slower. In some tests, I see
a 5 to 10% drop in performance when Ethernet driver is a module versus
builtin.
You might want to look at how the I/O schedulers are configured as an
example.
>>>
>>> The symbols exported to allow this would need to be EXPORT_SYMBOL_GPL().
>
>
> Why's that?
Because the kernel developers who hold the collective copyright on the
existing GPL TCP code do not want some vendor producing a closed source
binary module of "enhanced TCP".
next prev parent reply other threads:[~2005-02-23 4:22 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-02-22 14:34 [PATCH] TCP-Hybla proposal Daniele Lacamera
2005-02-22 15:42 ` Daniele Lacamera
2005-02-22 17:42 ` Stephen Hemminger
2005-02-22 18:03 ` John Heffner
2005-02-22 18:14 ` David S. Miller
2005-02-23 0:41 ` Tobias DiPasquale
2005-02-23 4:22 ` Stephen Hemminger [this message]
2005-02-22 19:07 ` David S. Miller
2005-02-22 20:16 ` Baruch Even
2005-02-23 11:58 ` Angelo Dell'Aera
2005-02-23 4:00 ` Matt Mackall
2005-02-23 17:27 ` Daniele Lacamera
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